<nav class="navbar navbar-default" role="navigation">
  <div class="container-fluid">
    <div class="navbar-header">
      <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse-example">
        <span class="sr-only">切换导航</span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
      </button>
      <a class="navbar-brand" href="">IURT</a>
    </div>
    <div class="collapse navbar-collapse navbar-collapse-example">
      <ul class="nav navbar-nav">
        <li class="active"><a href="{LINK_index}">首页</a></li>
        <li><a href="">关于</a></li>
        <li class="dropdown">
          <a href="" class="dropdown-toggle" data-toggle="dropdown">产品 <b class="caret"></b></a>
          <ul class="dropdown-menu" role="menu">
            <li><a href="">云服务器</a></li>
            <li><a href="">云虚拟主机</a></li>
          </ul>
        </li>
      </ul>
      <ul class="nav navbar-nav navbar-right">
        <li><a href="{LINK_login}">登录</a></li>
        <li><a href="">注册</a></li>
        <li class="hidden"><a href="">控制面板</a></li>
        <li class="dropdown hidden">
          <a href="" class="dropdown-toggle" data-toggle="dropdown">SCH <b class="caret"></b></a>
          <ul class="dropdown-menu" role="menu">
            <li><a href="">用户中心</a></li>
            <li><a href="">个人信息</a></li>
            <li><a href="">安全设置</a></li>
            <li class="divider"></li>
            <li><a href="">退出登录</a></li>
          </ul>
        </li>
      </ul>
    </div>
  </div>
</nav>